99 Honda cr250r engine rebuilt

[smokemaker]

I'm rebuilding the engine for my cr250r, I got a Wiseco piston for it, do I have to drill holes on the wiseco piston before installing it?

 

[darringer]

No, you don't need to drill the holes. .

 

[ctrlaltdl]

uh, that has a tenancy to reduce the compression!

 

[NacNac250F]

Only if the cylinder has an exhaust bridge and if the piston doesnt already have two holes on the exhaust side in it.